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Observation of H2 Evolution and Electrolyte Diffusion on MoS2 Monolayer by In Situ Liquid-Phase Transmission Electron Microscopy : Observation of H-2 Evolution and Electrolyte Diffusion on MoS2 Monolayer by In Situ Liquid-Phase Transmission Electron Microscopy

Cited 10 time in Web of Science Cited 20 time in Scopus
Authors

Kim, Jihoon; Park, Anseong; Kim, Joodeok; Kwak, Seung Jae; Lee, Jae Yoon; Lee, Donghoon; Kim, Sebin; Choi, Back Kyu; Kim, Sungin; Kwag, Jimin; Kim, Younhwa; Jeon, Sungho; Lee, Won Chul; Hyeon, TaeghwanLee, Chul-Ho; Lee, Won Bo; Park, Jung Won

Issue Date
2022-11
Publisher
WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Citation
Advanced Materials, Vol.34 No.45, p. 2206066
Abstract
Unit-cell-thick MoS2 is a promising electrocatalyst for the hydrogen evolution reaction (HER) owing to its tunable catalytic activity, which is determined based on the energetics and molecular interactions of different types of HER active sites. Kinetic responses of MoS2 active sites, including the reaction onset, diffusion of the electrolyte and H-2 bubbles, and continuation of these processes, are important factors affecting the catalytic activity of MoS2. Investigating these factors requires a direct real-time analysis of the HER occurring on spatially independent active sites. Herein, the H-2 evolution and electrolyte diffusion on the surface of MoS2 are observed in real time by in situ electrochemical liquid-phase transmission electron microscopy (LPTEM). Time-dependent LPTEM observations reveal that different types of active sites are sequentially activated under the same conditions. Furthermore, the electrolyte flow to these sites is influenced by the reduction potential and site geometry, which affects the bubble detachment and overall HER activity of MoS2.
ISSN
0935-9648
URI
https://hdl.handle.net/10371/189420
DOI
https://doi.org/10.1002/adma.202206066
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  • College of Engineering
  • School of Chemical and Biological Engineering
Research Area Chemistry, Materials Science

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